Impact of chamber "upgrade" on accuracy?

[i8asquirrel]

1911MAN I will try and send you some data this eve. I have multiple loads that are shooting well through both AR and bolt platforms.

[i8asquirrel]

I am loading LC brass,CCI 400 primer for all my loads

#1 125 gr Nosler BT over 18.0 gr 4227

#2 130 gr Speer HP over 20.2 gr 1680

#3 150 gr Speer sp over 15.5 gr H110

Subsonic:
Coal 2.260
190 gr Hornady btsp over 10.5 gr 4227 ( very accurate from my bolt doent cycle great in AR)

220 SMK 908gr 296

Hope this inho helps......

[snipecatcher]

Originally Posted by i8asquirrel

220 SMK 908gr 296

I bet that one has some recoil!

[i8asquirrel]

SORRY thats 9.8gr ......908 would need I hydralic press for compressed load.
WOW maybe a new wildcat idea?

[1911man]

Originally Posted by i8asquirrel

I am loading LC brass,CCI 400 primer for all my loads

#1 125 gr Nosler BT over 18.0 gr 4227

#2 130 gr Speer HP over 20.2 gr 1680

#3 150 gr Speer sp over 15.5 gr H110

Subsonic:
Coal 2.260
190 gr Hornady btsp over 10.5 gr 4227 ( very accurate from my bolt doent cycle great in AR)

220 SMK 908gr 296

Hope this inho helps......

What is your OAL on load #1 & #2? AR BBl mfg? Twist rate?

[i8asquirrel]

COAL for #1 &#2 I think is 2.110" ( what ever the Sierra data had stated for the bullit size)
The Barrel is a Schillen chromolly 1x10" twist 16" long..It was chambered with a PTG .300whisper reamer.

[BWE Firearms]

Is that 220 SMK 908gr 296 load going supersonic or warp speed.

[1911man]

Originally Posted by i8asquirrel

COAL for #1  I think is 2.110" ( what ever the Sierra data had stated for the bullit size)
The Barrel is a Schillen chromolly 1x10" twist 16" long..It was chambered with a PTG .300whisper reamer.

I thought we were on 300BLK here? I can get Whisper chambers to shoot well too, just not the 300BLK

[i8asquirrel]

1911 they are same = same i think the only differnce on my two is that one is 1x10" and the other is 1x8"

[1911man]

Originally Posted by i8asquirrel

1911 they are same = same i think the only differnce on my two is that one is 1x10" and the other is 1x8"

A PT&G Whisper reamer and a 300 Blackout reamer have very different throat lengths, the long throat on the BLK is what makes light bullet (110-125gr) supersonic accuracy harder to achieve.