I also load mine to full 10mm length, the 11.0g load isn't even compressed at 1.260I will say that 11.0 grains of LongShot is a lot and getting in the area of too much pressure! Your barrel probably has a good chamber support...BUT!~ Your 6" barrel length is yielding the higher velocity gains with the extreme loading you are using.
This was the data derived from ammo pull-down that actually caused a casing blowout, Underwood is known for pushing the envelope...
Cartridge is from Ammo Manufacture: Underwood 125gr Bonded FMJ
Ballistics Information: 357 SIG
Muzzle Velocity: 1475 fps
Muzzle Energy: 603 ft. lbs
Brass Make/Headstamp: Star Line – Brass
Bullet Make/Weight/Construction/Info; Length 0.5400”/Dia. 0.3555”:
125gr. JHP Actual weight 125.6 grains / 124.2 grains / 124.6 grains
C.O.A.L.: 1.1240” / 1.1235” / 1.1330”
Primer: Brass color
Case: Diameter 0.4220” all
Crimp Diameter 0.3785” / 0.3790” / 0.3790” crimp medium
Length 0.8600” / 0.8610” /
Powder Description/Positive ID/Type/ LongShot
Charge Weight: 9.8 grains
I'll make a quick note on this load. I ran these numbers on a cool 46 degree morning.Addition to the data above:
13.0g = 2051fps/840lbs .4265 casehead
None of the loads above recoil very hard. The heavy 180s have the most thrust but are still easy to manage. Cases fly about 4-5 feet at the max loads. With the lighter slugs like the 90s and 125s cases only fly around 3 feet at full steam. Compared to the 10mm the 357sig 180gr max loads have less push than a 220gr 10mm at 1200fps.P
It’s pretty amazing what can be done with that cartridge. I don’t reload but thanks for sharing. What is the recoil like with the heavier/faster loads?
No issues, i run 357 bullets in all my 9mm bore barrels. I usually find them to be more accurate than 9mm spec bullets. Just work up loads for each bullet and you wont have issues.I read your posts on page 4 of this thread, so I understand you are loading the cartridges long and using a 357 Sig barrel that has been throated in a Glock 20. But are there any issues using a .357 or .358 bullet in a 357 Sig barrel?
No 10mm, then added a 5" fusion w/n ramp bull barrel then throated it to run the heavy cast slugs.Ss30378,
Did that Ruger SR1911 start as a .45?