.... Have built a few rifles in the past but .30 sub. Vel. platform is a new one to me.
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looking for info on Twist-Rate for 30 ca. whisper on bolt action platform.
I have seen 10 twist mentioned but that seem extremely random for the extreme amount of different Wt. .30 rifle bullets out on the market.
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Want to load on the
Heavy max. .30 cal. bullet weight..
Considering / Sierra-220 grn. round nose. / looks like similar bullet shape to what I use accurately in sub-sonic .22 rimfire match rounds.
also:
Any info on Throat Depth on the Chamber Ream would be highly appreciated.
Since it wont be (confined to AR Mag.) Don't want the Large-Weight bullet ridding to far down in the boiler room. Got a little extra OAL to play with a bolt action as a platform.
also:
Is the sub-sonic .30-221 the same as shooting .22 rimfire sub rounds for barrel length. ?
the basic rule of thumb for sub .22 rimfire is that you gain no more velocity over a 16 inch barrel.
Is the same for Vel. on .30-221 sub-rounds . ?
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thanks....... :D
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