"Adjustable Weight" Compound-Round
Posted: Sat May 14, 2011 6:48 pm
Hey Guys,
I need a heavier round than the normal 178 gram compound round. So, I was planning on making my own end caps that are heavier. I even emailed the manufacturer about making heavier caps for me. They are open to doing it. But, I wanted to figure out how to experiment with the weight of the round searching for the ideal weight versus recoil I would feel (for those who do not know, I fire these from a pneumatic cannon at 230psi and the kick with a stock compound round is intense, but not unbearable). Anyway, I had a brain-storm and decided to go on-line looking for something to add to the round to add weight and this is what I came up with.
These are simple 2 inch OD, 1/4 inch ID fender washers I ordered from McMaster Carr. The washers weigh 18 grams each. I needed a longer bolt as well. So, with 10 washers and a longer bolt, this round now weighs 352 grams. I plan on experimenting with various numbers of washers looking for the maximum weight I can fire without hurting myself. As a side note, I just added a muzzle brake to my cannon. So, a heavier round should not be too terrible to handle.
Oh, also, I plan on wrapping electrical tape around the nose of the round, bringing it up to the barrel ID as a guide to prevent it from cocking in the barrel and scraping it. That should also help increase accuracy as it will help the round stay straight through the barrel.
Matt
I need a heavier round than the normal 178 gram compound round. So, I was planning on making my own end caps that are heavier. I even emailed the manufacturer about making heavier caps for me. They are open to doing it. But, I wanted to figure out how to experiment with the weight of the round searching for the ideal weight versus recoil I would feel (for those who do not know, I fire these from a pneumatic cannon at 230psi and the kick with a stock compound round is intense, but not unbearable). Anyway, I had a brain-storm and decided to go on-line looking for something to add to the round to add weight and this is what I came up with.
These are simple 2 inch OD, 1/4 inch ID fender washers I ordered from McMaster Carr. The washers weigh 18 grams each. I needed a longer bolt as well. So, with 10 washers and a longer bolt, this round now weighs 352 grams. I plan on experimenting with various numbers of washers looking for the maximum weight I can fire without hurting myself. As a side note, I just added a muzzle brake to my cannon. So, a heavier round should not be too terrible to handle.
Oh, also, I plan on wrapping electrical tape around the nose of the round, bringing it up to the barrel ID as a guide to prevent it from cocking in the barrel and scraping it. That should also help increase accuracy as it will help the round stay straight through the barrel.
Matt