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Old December 27, 2012, 02:07 AM   #1
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How do you tighten a 12 Ga. pattern?

Is anyone familiar with how shotgun shells were reloaded before shotguns had adjustable or interchangeable chokes? I have a BT 99 with a fixed choke (I.Mod.) and would like to tighten it up some. The I.M. choke is good at 16yds.,but not so good at the 21 yd line.
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Old December 27, 2012, 10:36 AM   #2
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Work with different wads and pressure seating the wads.

Primers also make a difference.

With shotguns I've found it easy to match the loads to your existing barrel.
Kraig Stuart
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Old December 27, 2012, 10:43 AM   #3
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I'd just buy a different barrel...perhaps a threaded one. Can you actually do that on this model?

Last edited by Okcafe86; December 27, 2012 at 10:50 AM.
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Old December 27, 2012, 11:27 AM   #4
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Use #8 Magnum shot. Harder shot deforms less. The rounder pellet gives tighter patterns. Use the maximum weight/amount of shot allowed 1 1/8 oz. Magnum shot will weigh less than standard shot, the shot bushing can be adjusted to drop a full 1 1/8 oz, resulting in a higher pellet count. If your load is 1200 fps, the pattern will get tighter with less velocity like 1145fps. A slower burn rate powder that gives the same velocity may deform pellets less. For 27yds, you will need 1200 fps to keep the same lead used at 16yds. Larger 7 1/2 shot will deform less then #8, but will leave holes in the pattern. If all else fails, plastic buffer may be place in with the shot.

Last edited by 243winxb; December 27, 2012 at 11:39 AM.
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Old December 27, 2012, 02:36 PM   #5
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The IM SHOULD be fine at 21; that being said, you might want to consider having the barrel threaded for choke tubes, assuming you have already been to the pattern board for exact results.........
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