Elkins45
Member
This photo is of a 200 grain 40 caliber bullet from a mold I designed on the Mountain Molds website. My design goal was to create a heavy 10mm bullet that took up the least amount of room inside the case as possible. In other words, I tried to design it to be as short for the weight as possible. It's a 75% (.300) meplat and is significantly shorter than the RCBS 200 grain design I was using previously.
Due to the relative cost and scarcity of 10mm cases I bought a Lone Wolf 40 S&W barrel for my Glock 20. That opens up some interesting possibilities in that the barrel will chamber a round with a COAL that would never fit a standard 40 S&W magazine but will easily fit inside the longer 10mm magazine of the G20. The photo shows a dummy round with a boolet loaded out much farther than I could get away with seating it in a 10mm case. I arrived at this length by gradually seating it deeper and deeper until the head was flush with the barrel hood when dropped into the chamber of the 40 S&W barrel. The dummy round fits into the 10mm magazine at about the same length as a regular 10mm round does.
This raises the possibility of maybe getting heavy bullet performance from the 40 barrel that more closely approximates 10mm performance since there's now more powder space available due to the long seating length. I'm going to experiment (very cautiously, I assure you) with seeing if I can exploit the extra COAL. Bullet setback is a fear, of course, but by concentrating on slower powders at first I might be able to prevent that possibility by loading to near 100% density.
Surely I'm not the first person to contemplate going down this road? Anybody have any results they would like to share about shooting "40 longs"? I should add that the chances of me shooting these 40 longs in a regular 40 are nil, since they won't fit in the magazine and also because I don't own a 40 other than the Glock barrel.
Due to the relative cost and scarcity of 10mm cases I bought a Lone Wolf 40 S&W barrel for my Glock 20. That opens up some interesting possibilities in that the barrel will chamber a round with a COAL that would never fit a standard 40 S&W magazine but will easily fit inside the longer 10mm magazine of the G20. The photo shows a dummy round with a boolet loaded out much farther than I could get away with seating it in a 10mm case. I arrived at this length by gradually seating it deeper and deeper until the head was flush with the barrel hood when dropped into the chamber of the 40 S&W barrel. The dummy round fits into the 10mm magazine at about the same length as a regular 10mm round does.
This raises the possibility of maybe getting heavy bullet performance from the 40 barrel that more closely approximates 10mm performance since there's now more powder space available due to the long seating length. I'm going to experiment (very cautiously, I assure you) with seeing if I can exploit the extra COAL. Bullet setback is a fear, of course, but by concentrating on slower powders at first I might be able to prevent that possibility by loading to near 100% density.
Surely I'm not the first person to contemplate going down this road? Anybody have any results they would like to share about shooting "40 longs"? I should add that the chances of me shooting these 40 longs in a regular 40 are nil, since they won't fit in the magazine and also because I don't own a 40 other than the Glock barrel.