logo
 

Go Back   HuntingNet.com Forums > Firearms Forum > Black Powder

Black Powder Ask opinions of other hunters on new technology, gear, and the methods of blackpowder hunting.

Reply
 
Thread Tools
Old 06-19-2017, 08:16 AM   #1
Spike
 
Join Date: Jun 2017
Posts: 19
Default New cap GPR help?

Greetings and salutations,
Being a bit of a Black powder nerd..er..."enthusiast" for over 20+ years using both a Lyman Great plains flintlock (actually me first BP fire arm) and a Lyman Great plains Pistol and I recently picked up a GPR in percussion.

But there is something odd about it that makes me lift an eyebrow (in my best spock-like imitation) the hammer on the lock has quite a bit of front-to-back slack around the tumbler while the pistol and flintlock are (even after all these years) rock steady with no looseness at all.

I'm sure this can't be normal.

All so, what is the best touch hole dia for a GPR flint?, about a decade ago the original liner was replaced by a gunsmith and ever since then it's been a crap shoot if I get ignition or just a flash..I measured and the hole is slightly less than 1/16" (1.5mm ) isn't it suppose to be 5/64" (1.9-2 mm) for optimal?

Last edited by NerdLord; 06-19-2017 at 08:21 AM.
NerdLord is offline   Reply With Quote
Old 06-19-2017, 08:26 AM   #2
Giant Nontypical
 
MountainDevil54's Avatar
 
Join Date: Dec 2008
Location: Boncarbo,Colorado
Posts: 9,022
Send a message via Yahoo to MountainDevil54
Default

Peen or shim it with brass shim stock.

Factory size touch hole has always worked best for me when I got a good one.
__________________
'Devil knows Best

“Hear one person before you answer, several before you decide.”
MountainDevil54 is offline   Reply With Quote
Old 06-19-2017, 08:50 AM   #3
Dominant Buck
 
cayugad's Avatar
 
Join Date: Feb 2003
Location: Wisconsin
Posts: 21,194
Default

I use the touch hole liners sold by RMC Sports http://www.rmcoxyoke.com/inc/sdetail...ements/6549/84

the Lyman they sell works good in my Lyman Flintlock rifles.
__________________
"Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, a total wreck, screaming Yahoo, with a big smile on your face."
cayugad is offline   Reply With Quote
Old 06-19-2017, 09:20 AM   #4
Spike
 
Join Date: Jun 2017
Posts: 19
Default

Quote:
Originally Posted by MountainDevil54 View Post
Peen or shim it with brass shim stock.

Factory size touch hole has always worked best for me when I got a good one.
Don't know what the factory liner was, I trusted the smith to put the right one in. I'd of done it myself but didn't feel too confident in my abilities at the time.
NerdLord is offline   Reply With Quote
Old 06-19-2017, 09:21 AM   #5
Giant Nontypical
 
MountainDevil54's Avatar
 
Join Date: Dec 2008
Location: Boncarbo,Colorado
Posts: 9,022
Send a message via Yahoo to MountainDevil54
Default

its a screw, not very hard to install it with a screw driver.
__________________
'Devil knows Best

“Hear one person before you answer, several before you decide.”
MountainDevil54 is offline   Reply With Quote
Old 06-19-2017, 10:14 AM   #6
Boone & Crockett
 
bronko22000's Avatar
 
Join Date: Jan 2004
Location: Eastern PA
Posts: 10,505
Default

I like my flash hole to be .050 - .055" in diameter. I take the original (flat face with screw driver slot) and drill a shallow "V" in it with a 1/8" or 9/64" bit. Not much. Just enough to funnel the flame to the touch hole. Works better than the flat face.
__________________
Senility has been a smooth transition for me.
"Never miss a good chance to shut up." (Will Rogers)
When you're dead you don't know you're dead. All the pain is felt by others. Same thing happens when you're stupid!
With God by your side your stumbling blocks become stepping stones.




bronko22000 is offline   Reply With Quote
Old 07-05-2017, 08:19 AM   #7
Spike
 
Join Date: Jun 2017
Posts: 19
Default

Muzzle loader.com was very good about doing an exchange on the cap GPR, the replacement is as rock steady as the flint...kudos.

I still couldn't get the old SS liner out to replace, but in the process ended up opening up the touch hole, greater than 1.6mm (.063", the original 1/16") but less than 2.0mm (.08", 1/12").

I'll try this and see how it performs, if not then in goes the new liner.

Last edited by NerdLord; 07-05-2017 at 08:25 AM.
NerdLord is offline   Reply With Quote
Old 07-05-2017, 08:26 AM   #8
Giant Nontypical
 
Muley Hunter's Avatar
 
Join Date: Feb 2011
Location: Colorado
Posts: 9,428
Default

I'd try harder to get it out. At some point you'll have to when it wears out.

Too big a hole is as bad as too small a hole.
__________________
Pete

"You have reached the pinnacle of success as soon as you become uninterested in money, compliments, or publicity."
Muley Hunter is offline   Reply With Quote
Old 07-05-2017, 02:08 PM   #9
Fork Horn
 
Join Date: Apr 2017
Posts: 199
Default

Too big a hole can cause some major problems as well. It actually verges onto a safety issue.
hunters_life is offline   Reply With Quote
Old 07-17-2017, 04:00 PM   #10
Spike
 
Join Date: Jun 2017
Posts: 19
Default

took flint out Sunday with the touch hole slightly enlarged (from 1/16 to 5/64) or >1.5mm but <2.0mm) and the difference was amazing!...even forgetting my 4f primer and using 3f, if it sparked it fired! (at least until the frizzen and flint got too sooty).

And to think of all those years of frustration when I wanted to chuck it off a cliff and get out of muzzle loading!

Last edited by NerdLord; 07-18-2017 at 08:13 AM.
NerdLord is offline   Reply With Quote
Reply


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -8. The time now is 06:29 AM.


Search Engine Friendly URLs by vBSEO 3.6.1