30 nos, adjusting loads for faster twist
- Thread starter Philward
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None. According to a article by Brian Litz you might loose 10 fps or about 5 fps per one inch of twist increase.
If you have new rifle barrel you should pretty much start everything over. You have the ability to run the Berger 245. And would give it a try.
sierracharlie338
Well-Known Member
Tagging for later info. Keep us posted on how the 210 ABLRs shoot I may add those to the list of projectiles for my 30Nos as well.
Not so great so far, but not awful. Only have 7828 and RL22 to use with it. Have not did any seating depth tests, trying to pick a load to use. Velocities running lower than my load data says they should be, at least for 7828. But they used 7828ssc, so... RL22 was actually right on what the data said. 100yd targets attached. Got a little more velocity from the CCI primers than Rem primers with same load.
I would go to a Win Mag or Fed 215 in a cartridge with that much powder in it. I think you will find the SDs drop and your groups will tighten up. It certainty does in my 7 and 30 RUMS and 378 Bee. I would take whichever load you like, play with the seating depth, then add powder till you start to see pressure or max velocity.
New rifle, factory not custom. Browning Hells Canyon LR.
I wouldn't bother with the 210s. Shoot the 215s, or the 245s. The 215s are easy to tune
sierracharlie338
Well-Known Member
Definitely been my experience with my last 300wm
The bigger consideration when changing up the twist ratio is "Will the shorter twist still stabilize my currently used bullets" Typically a fast twist barrel is better at stabilizing a longer bullet and a slower twist barrel is better at stabilizing a shorter bullet. Longer bullets are the heavier ones in the caliber that you are interested in.
Heavier than 210's you think.
This is a truly unlikely scenario. It is nearly impossible to over spin a shorter bullet. Within the reasonable weight and twist choices for most hunting rifles a faster twist will not degrade the accuracy of lighter/shorter bullets. A 1:7 TWIST ON A 223 WILL SHOOT 40 GRAIN vmax just as well as a 1:12 but will also shoot 95 grain bullets that the slower twist would never stabilize. Same holds true for most cartridges.
Capt RB
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I'd look at slower powders. I have retumbo for my prc, however in the 30 Nos I'd try Rl33 with a 225 or 230 or the 245 if you can find them. I have 215 and 230 bergers as well as the 225eldm's for my prc. I have not got started yet but will in the coming weeks as the fishing season ends.
