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RR,
Yes and no. The 240 Gibbs is very similar but...... The Gibbs shoulder is a wee bit shorter, base to body juncture (2.145 VS 2.230) The soulder diameter is .455 compared to .458 and the shoulder is at 35 degrees rather than the 45 degrees of the laser. I do not have the capacity data but would guess given the differances, about 71-71.5 grains VS the 72 of the Laser. The load data with H-4350 and H-4831 is similar, but the data with H-870 is a good bit better in velocity.
As H-870 and AA-8700 (same surplus powder) are no longer available, I am looking at Retumbo to see if it might fill the void created by the withdrawal of the other two powders. I am also thinking of trying VN 560 as that is the powder I use in my 300 WSM. There are also some surplus 50 Cal powders to look at if I can not get where I want to go with the commercial stuff.
John did mention in 2008 that the Laser was very similar to the Gibbs.
Most loads with this style case, large capacity, long and skinny use the old standby extruded powders, 4350 and 4831. I guess I could try some of the equivelent WW ball powders, but, although I have several pounds, (gifts) in unopened cans, I have never put a grain into a case.
But, I am always willing to learn from experiance.
Best,
Ed
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