I am considering buying a Grendel off a friend. He let me borrow it to test drive and we can't get it to hit for crap. Like 1.25" is the absolute best 100 yard 3 shot group we've gotten and most groups are between 2" and 3". It's got a guiysell(wow that's a hard brand to spell...) trigger and we've been shooting bagged on a bench.
Here's what I know about the gun. He bought the upper from Alexander Arms and thinks the chamber was killed wrong. When ejecting a live shell the bullet would sometimes stay in the chamber so he'd get a mag full of gunpowder. He sent it to Specialized Dynamics in Arizona. That guy specializes in varmint guns. He couldn't get it to behave so he rebarrelled it. The new barrel is 18" with a 1x9 twist. That was a couple years ago and it's been a safe queen since.
We couldn't get it to hit so we called AA. after talking about a lot of different possibilities they said the barrel doesn't have a fast enough twist. 1x9 is fine for a 20" or longer barrel but for 18" or under, they said they use 1x7.5. We are shooting factory 123 grain a max and hand loaded 129 grain sst.
We tried heating up our hand loads but it looks like the bullets just won't stabilize. Maybe with a lighter bullet it would shoot better? I don't want to go lighter though as this is going to be a night hog hunting gun.
So, anything else I should try? Anything short of rebarrelling that can be done?
Here's what I know about the gun. He bought the upper from Alexander Arms and thinks the chamber was killed wrong. When ejecting a live shell the bullet would sometimes stay in the chamber so he'd get a mag full of gunpowder. He sent it to Specialized Dynamics in Arizona. That guy specializes in varmint guns. He couldn't get it to behave so he rebarrelled it. The new barrel is 18" with a 1x9 twist. That was a couple years ago and it's been a safe queen since.
We couldn't get it to hit so we called AA. after talking about a lot of different possibilities they said the barrel doesn't have a fast enough twist. 1x9 is fine for a 20" or longer barrel but for 18" or under, they said they use 1x7.5. We are shooting factory 123 grain a max and hand loaded 129 grain sst.
We tried heating up our hand loads but it looks like the bullets just won't stabilize. Maybe with a lighter bullet it would shoot better? I don't want to go lighter though as this is going to be a night hog hunting gun.
So, anything else I should try? Anything short of rebarrelling that can be done?