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30 BR Bullet for 300 yd shooting

I was doing a little experimenting with my 30 cal bullet swaging dies with some left over cores and short jackets and came up with a 126.5 gr BT finished bullet.
The BT is the same as the the one on Sierra's 168 gr MK. Its a 7 cal tangent ogive . I think it may be too light for my 308 Win. but was wondering how it would behave in a BR out to 300yds ? My 12 twist 308 may be over driving them.
 
I have and will again shoot the 125 sierra matchkings out of a 10 twist with good results. I think you can only try them in the .308 and they will or should surprise you. In a 30 br my friend has he is shooting the 125 matchlings with fairly impressive groups. His barrel is getting tired but does real good. He shoots out to 200 yds at 1/2 moa and that isn't bad with a tired barrel.
 
I have a 15 twist 30 br on a Hunter bench rest rifle that I shoot several custom makers 125s and they shoot well. I would be interested in what a BT that weight would do at 200 and 300 yards.I have tried 125s out of 17 and 18 twist also and they shoot ok.
 
Just to get it out explicitly, the question is what twist rate is required to stabilize them.
 
According to an old Sierra reloading manual, a BT on a bullet should give about 12% less wind drift over a FB.
During my high-power shooting days, I had to add a minute and a quarter to my 300 yd zero in my 308 when I used a 168 FB instead of a 168 BT. The 300 yd timed rapid groups were a little tighter with the BT over the FB . I believe this was because
of the wind pick ups and let offs during the rapid fire string. The BT's handled the pick ups and let offs better than the FB's.
 
Hi Eddie Harren

I'm using a 1.075 jacket. I like this length because when you BT the jacket you end up with a pronounced BT and still
have enough bullet shank to get the job done.

BCB
 
Bob, Would be willing to take a hundred or so of your hands and give them a try. Send me a pm with cost, i already have your address. Bob
 
BCB said:
I was doing a little experimenting with my 30 cal bullet swaging dies with some left over cores and short jackets and came up with a 126.5 gr BT finished bullet.
The BT is the same as the the one on Sierra's 168 gr MK. Its a 7 cal tangent ogive . I think it may be too light for my 308 Win. but was wondering how it would behave in a BR out to 300yds ? My 12 twist 308 may be over driving them.

For a bullet as described - BT, probably about 1.10" long, anything from a 1:16", or, faster, will work quite well. To a large degree, "over spinning" a BR quality bullet (jacket wall-thickness variation <0.0003") has little effect on precision - BTDGT-s. ;) RG
 

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