Heavy bullets w/ faster powders

[Garrett]

When I bought my .300 Whisper for the T/C Contender from SSK it came with a couple of pages of load data, including subsonic loads using AA#2.

Later on, SSK apparently ran into some problems using that powder, as noted at the bottom of this page (http://quarterbore.com/300whisper/subsonic.html). Specifically, it says:

" Important Notes from JD Jones himself:

I would appreciate it if you would delete the Accurate #2 data and say that in SSK AR-15 and M-16 no powder faster burning than Accurate #9 should be used. The gas system is timed for sub sonic with powders with burning rates from #9 through 1680."

The issue appears to be one specific to the timing of gas-operated rifles. Is there any issue in bolt-actions or single-shots?

The reason I ask, I have been using AA#9 and H110 with 220 gr. SMKs with the bullet traveling at around 1050 fps. However, there is still more noise than I would like when shooting suppressed. It sounds similar to removing a quick-connect hose from a pneumatic tool, but not as loud. I'd like to try a faster powder and compare the sound signature, but I don't really want to blow up my gun in the process.

If not #2, has anyone tried using some medium-fast powders with 220 or 240 gr. bullets?

[320pf]

Here are some reloading data from the Accurate Arms website:

Sierra 220 HPBT C.O.L.=2.245"
Powder-grains-Vel.--p.s.i.
No.2---5.5----889---52,600
No.5---6.3---1062---38,200
No.7---7.5---1043---44,500
No.9---8.2---1056---39,500

The fast powder load should work well in a bolt gun or T.C.

I hope this helps

320pf

[redtazdog]

The load
AA No.5---6.3---1062---38,200
.
is a quiet load in my TC and B Action
but does not cycle the AR like AA 1680

[dksd39]

For 220gr SMK's try loading 8.5gr of LilGun. You will be thrilled with the results and you will stop looking at the other powders.

[libertyswiss]

Hi guys

I want to reload SMK 220grs. with 8.0grs. IMR 800x for my AR15 with 10,5"-barrel.
Has anybody tried this load? Maybe this powder is too fast for the pistol gas tube and with 8grs. and the 220's i hope that powder will not be pressed...

Somebody with experience in this combination?

Thanks for help.

[libertyswiss]

anyone with IMR 800x & .300whisper-experience?? :frown:

[prebancolt]

The load
AA No.5---6.3---1062---38,200
.
is a quiet load in my TC and B Action
but does not cycle the AR like AA 1680

I have a 16" setup with the gas port in the pistol position. I just tried some loads with 7.6 gr of AA No. 5 behind 220gr SMKs and I was getting 986-1016 fps. This load cycled fine in my ar. I have some H110, but I haven't tried it yet. Need more time to play....


J

[gary0529]

I'll have to agree with dksd39 and say that Lil'gun is now my go to powder in my bolt action 300 Whisper.
Consistent velocities with a wide variety of bullets and sooooo much cleaner than H-110

Gary

[N310toN170]

My vote goes to N110...more consistent than the RedDot or the faster powders (won't cycle) and alot cleaner than H110 (similar pressure but extruded not ball).

[sten668]

I have a lot of Unique and have been using 6-6.2 grains in my 17in bolt gun for 175gn and 180gn bulk bullets. It is much quiter than my H110 loads.

[justshoot]

Your shooting a Contender not a AR ? , I totally dumped the A#9 on my boltaction. Not AR so you got 'No Need' for all the gas & let-off & noise.
I been working up loads with Vihtiv. N-320 & it is like night & day on the sound. Less gas is less noise.
try using @ about 6.5 grn. N320 for 220 to 240 grn weight. 6.3 grn will get you to around the mid 900 fps mark for Vel. So thats is where I would start.
.