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Search took 0.01 seconds. Search: Posts Made By: RobRat
Forum: 300 Whisper Rifles and Pistols 07-02-2011, 09:03 AM
Replies: 4
Views: 1,210
Posted By RobRat
SBRing a 300/221 - how short?

I'm about ready to send in my SBR paperwork on an AR (starting with a 22LR build), and am wondering about shortening my 300/221 upper. I have a 16.5" 1:8 twist upper now with the gas block in the...
Forum: 300 Whisper Ammo and Reloading 05-24-2011, 10:37 PM
Replies: 16
Views: 3,422
Posted By RobRat
I had the 'smith take a piece of left over...

I had the 'smith take a piece of left over barrel, and had him run the reamer in to 1/2 shoulder, so I would have a comparator of sorts. I had forgotten about this piece until now.

When I drop a...
Forum: 300 Whisper Ammo and Reloading 05-23-2011, 11:23 PM
Replies: 16
Views: 3,422
Posted By RobRat
Thanks for the detailed answers, lots of things...

Thanks for the detailed answers, lots of things to think about!

I have a chrono, but lately my range time has been limited. It seems that every time I pull my chrono out, then 5 other shooters...
Forum: 300 Whisper Ammo and Reloading 05-22-2011, 09:28 PM
Replies: 16
Views: 3,422
Posted By RobRat
Question My 300/221 acuraccy needs to be better

I put together two 300/221 rifles (1:8 twist McGowan barrels, chambered by the same 'smith with the same reamer) and got a YHM-762 QD can and mounts for both. The AR was a challenge to get to cycle...
Forum: 300 Whisper Ammo and Reloading 02-10-2011, 10:39 PM
Replies: 14
Views: 3,204
Posted By RobRat
I had tried H4198 over some 200gr SMK's. Start...

I had tried H4198 over some 200gr SMK's. Start at 13.0 and work down from there.

11.8 was a little over 1000fps in my rifle. It was the first powder I tried that would cycle my action with...
Forum: 300 Whisper Ammo and Reloading 02-08-2011, 09:07 PM
Replies: 4
Views: 1,185
Posted By RobRat
First round super, the rest sub

I had 1/2 and our to shoot on Satuday, and wanted to shoot some loads, to see where they went subsonic. I was shooting a 300/221, 16-1/2" AR15 upper, topped with a YHM 762 Phantom suppressor. I...
Forum: 300 Whisper Ammo and Reloading 02-06-2011, 10:49 AM
Replies: 2
Views: 925
Posted By RobRat
Info on the speed of sound?

Is there a table/chart/website that has info on the speed of sound? What are the major factors?

I'm working on developing sub-sonic loads, and want to know what conditions I need to be aware of,...
Forum: 300 Whisper Ammo and Reloading 01-27-2011, 10:57 PM
Replies: 7
Views: 2,010
Posted By RobRat
Brass cracking just behind shoulder

I'm on my 5th loading of a batch of 300/221 brass, and am finding cracks just behind the shoulder on a number of the cases. The cracks run about 1/2 way around the circumference of the case, on the...
Forum: 300 Whisper Rifles and Pistols 12-08-2010, 07:21 AM
Replies: 33
Views: 5,111
Posted By RobRat
Simple solution - send a couple of cases to Lee...

Simple solution - send a couple of cases to Lee Precision, along with a check for $29, and have them make a custom "factory crimp" die for you. Takes about 3 weeks.
Forum: 300 Whisper Ammo and Reloading 11-28-2010, 09:34 AM
Replies: 6
Views: 1,458
Posted By RobRat
Fed 205 primers, AA1680, SMK 220's, seated to...

Fed 205 primers, AA1680, SMK 220's, seated to 2.09 (Per AAC's data).

The rifle is an AR upper with a McGowen 1:8 barrel, 17" long, TP555 gasblock in the pistol position.

With my notes gone,...
Forum: 300 Whisper Ammo and Reloading 11-27-2010, 05:07 PM
Replies: 6
Views: 1,458
Posted By RobRat
Cold weather affect AA1680?

Just go my new YHM Suppressor, and went to the range today to try it out on my 300/221 upper, and test some loads. Conditions - COLD (around 34F), windy, snow flurries. And because its 2 days...
Forum: 300 Whisper Ammo and Reloading 10-18-2010, 07:14 PM
Replies: 13
Views: 2,746
Posted By RobRat
220 vs 240 Sierra Match Kings

Playing around with my 300/221 1:8 twist AR upper, developing some subsonic loads while awaiting the BATFE to approve my Suppressor purchase...

Finally got the bugger cycling 100%, AA1680 was the...
Forum: 300 Whisper Ammo and Reloading 10-14-2010, 05:23 PM
Replies: 7
Views: 1,741
Posted By RobRat
As was said previously, you don't absolutley...

As was said previously, you don't absolutley "need" it.

If you "want" a crimp die, send a seated case to Lee, along with $29 (I think- -the instructions are on the Lee Precision website), and in a...
Forum: 300 Whisper Rifles and Pistols 10-09-2010, 05:11 PM
Replies: 13
Views: 3,392
Posted By RobRat
Tried the H4198 under the 200SMK's - and it...

Tried the H4198 under the 200SMK's - and it cycled wonderfully! The slower powder is doing the trick, If I can only get some AA1680!!!

The range was crowded, and I was only able to set the chrono...
Forum: 300 Whisper Ammo and Reloading 10-03-2010, 10:36 PM
Replies: 3
Views: 1,300
Posted By RobRat
Anyone tried H4198 or H322?

I'm looking for a slower powder to solve a short stroking issue. I haven't been able to get any AA1680, but looking at the burn charts H4198 and H322are close to a # of powders that are on published...
Forum: 300 Whisper Rifles and Pistols 10-03-2010, 10:17 PM
Replies: 13
Views: 3,392
Posted By RobRat
Checked my TP555 gas block, mine is (going...

Checked my TP555 gas block, mine is (going clockwise) closed, then partially open, then fully open. Talked to the 'smith that installed it, he didn't remember the size of the port, but he says he...
Forum: 300 Whisper Rifles and Pistols 08-28-2010, 09:19 AM
Replies: 3
Views: 1,580
Posted By RobRat
Nice rifle! :machinegu Did you have to do...

Nice rifle! :machinegu

Did you have to do anything to the Magpul mags to get them to feed? They won't feed the Whisper rounds I've loaded.
Forum: 300 Whisper Ammo and Reloading 08-27-2010, 07:39 PM
Replies: 9
Views: 2,305
Posted By RobRat
I've got 296 and H4227 - where are you subsonic...

I've got 296 and H4227 - where are you subsonic with the 200gr sierra? The sierra data has 10.6gr of W296 going 1100 fps, how low are you going with it?

What is your range with the H4227? I...
Forum: 300 Whisper Rifles and Pistols 08-26-2010, 11:42 PM
Replies: 13
Views: 3,392
Posted By RobRat
Update - its working better.... I switched...

Update - its working better....

I switched the lower to a A2 stocked lower w/rifle buffer, and got short stroking about every 3 rounds. I'm going to try to load up some rounds with AA1680 (if I...
Forum: 300 Whisper Rifles and Pistols 07-30-2010, 07:27 PM
Replies: 11
Views: 3,978
Posted By RobRat
The 300/221 / 300 Whisper is a wildcat, and like...

The 300/221 / 300 Whisper is a wildcat, and like any wildcat, dimensions are slightly "flexible".

Get a chamber cast done if possible.

Make up a few cases with bullets you plant to use, and...
Forum: 300 Whisper Rifles and Pistols 07-25-2010, 09:05 PM
Replies: 13
Views: 3,392
Posted By RobRat
Question Short Stroking in Subsonic AR15

I had a local gunsmith build an AR15 upper for me in 300/221, and a matching barrel on a Savage bolt action. Specs on the AR barrel - 16.5", 1:8 twist McGowan barrel, TP555 3 position gas block in...
Forum: 300 Whisper Ammo and Reloading 07-19-2010, 09:35 PM
Replies: 3
Views: 1,176
Posted By RobRat
#41's work fine for me in the AR, but very...

#41's work fine for me in the AR, but very inconsistent in a Savage bolt rifle I had built. Switched to Fed 205's, and the Savage shoots great.
Forum: 300 Whisper Ammo and Reloading 06-26-2010, 08:59 PM
Replies: 9
Views: 2,305
Posted By RobRat
Any Subsonic loads for a 200gr SMK?

I've looked at the Sierra data, and their slowest listing is for 1100FPS with the 200 gr SMK, and a statment "Loads less than minimum charges shown are not recommended".

Got a couple boxes of the...
Forum: 300 Whisper Ammo and Reloading 06-26-2010, 08:52 PM
Replies: 25
Views: 5,502
Posted By RobRat
Just starting out with my300/221 w/1:8 twist, but...

Just starting out with my300/221 w/1:8 twist, but I loaded the Sierra 110gr # 2110 bullet, Fed 205 primers, with Winchester 296 powder from 19 to 20 gr and was getting sub 1" groups at 100...
Forum: 300 Whisper Ammo and Reloading 12-30-2009, 07:26 AM
Replies: 8
Views: 2,085
Posted By RobRat
One other thing to consider is Loaded Neck...

One other thing to consider is Loaded Neck Diameter. You need to know what your neck ID of the chamber is, and make sure you're 0.002"-0.003" smaller than that with your loaded rounds. (maybe...
Showing results 1 to 25 of 27
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