Highly likely you've got a thou or so of frame crush at the back of the barrel. I've seen this on a goodly number of Rugers and Smiths, including my .45 Colt /ACP Redhawk which I've yet to get around to fire-lapping the problem out of. In my case, it leads a little bit with my standard 230 gr Ranch Dog tumble lube bullet rolled in Ben's Liquid Lube (pretty dry stuff), but not at all with conventional groove slugs filled with Ben's Red (pretty squishy beeswax / grease combo).
WWJMBD?
In the Land of Oz, we cast with wheel weight and 2% Tin, Man.
Nine grains of unique pushing the RCBS 270-SAA SWC with about any good lube has performed nicely in my Redhawks and Blackhawks.
Heavy bullets = dead pigs!
Salvaging old Marlins is not a pasttime...it's a passion
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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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