Dealing with Frustration

[ET]

This has been one mucked up year for what I wanted to accomplish with 50Cal PT testing. The pandemic has stolen my range access for now but hope certain restrictions will soon be removed to give me a few outings this year. About the only possible good news is that I found a seller that says he can get me some Reloder7. Because of powder scarceness I searched high and low before finding a source. Okay hopefully I will have this powder in stock for when I get to testing it.
What I still need to test (next) with 4227 is using a standard Savage BP. I need to see if it will misfire as so many others have said. I still suspect insufficient load resistance and dirty BP are the culprits if it misfires. One can’t expect best performance for powder ignition on any loose-fitting load. Sure, you can use a powder that ignites easier but you won’t get the performance it can provide.

Keep this in mind, a load resistance of say 20lbs will maintain 20lbs of compression on the powder after it’s compressed. Secondly a tighter bore fit will hold a bullet more concentric to the bore when using a sabot. But don’t take my word for it, try it and see what happens.

Then if time allows and I have Reloder7 on hand I will fore-go 2400 powder testing till later. Even if I don’t have a chronograph operating, I still can see how close I can get to 40k pressure and check velocities later. By observing my group size with different load amounts, I should also be able to determine if I’m on the sweet spot. I have high hopes and gut feeling for Reloder7 for 250gr and 275gr bullet.
Well back to the waiting game.

[GMB54-120]

Re7 and a 250gr will simply run out of barrel before you can make efficient use of enough powder. N120 will get in the 2500fps range but not very reliably when temps fluctuate. You can hit 2400fps with N120 and a 275gr without too much trouble. Load is 62gr or 63gr IIRC. I never tried pushing a 275gr hard with Re7. It might work but you are looking at over 65gr to get there.

[ET]

Sept 2, 2020 10:18:13 GMT -5 GMB54-120 said:

Re7 and a 250gr will simply run out of barrel before you can make efficient use of enough powder. N120 will get in the 2500fps range but not very reliably when temps fluctuate. You can hit 2400fps with N120 and a 275gr without too much trouble. Load is 62gr or 63gr IIRC. I never tried pushing a 275gr hard with Re7. It might work but you are looking at over 65gr to get there.

With limited load information I take it your assessment is based on a fixed load parameter. I won't be restricted to a fixed load parameter
and will be able to somewhat adjust the a parameter that will affect the powder load burn rate. Instead of debating Reloder7 usefulness I will let future PT traces tell the story. Then we can have a good discussion on Reloder7.