I really wanted the 311-206-RN for my 7.5” pistol I’m putting together but they didn’t have any of the PB in stock. For those that shoot the 242 in their 300blk shorties, what kind of velocities can I expect? I’m hoping for keeping them in that golden subsonic range of 1050fps. Other concerns are twist rate. I’m hoping to get 1:7 but will a 1:8 also work with these long boolits?
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IIRC Dolomitesuperfly had Acme make a 240 that is reported to work very well. 300blktalk.com
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I am shooting an Accurate Molds 31-247 (which appears to have been replaced with a 31-250E) in a 10.5" 1:8 barrel. PC and sized to .3095". I started at about 1050 fps but ended up reducing that slightly to improve accuracy. I am not sure if I ran it across the chronograph again after adjusting the powder charge.
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| BP | Bronze Point | IMR | Improved Military Rifle | PTD | Pointed |
| BR | Bench Rest | M | Magnum | RN | Round Nose |
| BT | Boat Tail | PL | Power-Lokt | SP | Soft Point |
| C | Compressed Charge | PR | Primer | SPCL | Soft Point "Core-Lokt" |
| HP | Hollow Point | PSPCL | Pointed Soft Point "Core Lokt" | C.O.L. | Cartridge Overall Length |
| PSP | Pointed Soft Point | Spz | Spitzer Point | SBT | Spitzer Boat Tail |
| LRN | Lead Round Nose | LWC | Lead Wad Cutter | LSWC | Lead Semi Wad Cutter |
| GC | Gas Check |
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