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Joined: 28 Aug 2014 Posts: 924 Location: Eastern Tennessee

I was wondering if others have tested the pressure impact of taking 1 oz loads and adjusting for spreader inserts (7/8 oz of lead and the spreader insert)?

I am thinking of ordering some of these:

https://www.precisionreloading.com/cart.php#!l=PW&i=B16GA

Then Stuffing them in a RGL with a CB10016 using recipes in the 9,000-10,000 PSI range.

I was curious is anyone had tested for PSI changes as a result of the insert.

The 16 ga. Poly wad Spred-R inserts almost exactly displace 1/8 oz. of shot. I have successfully used them for both 7/8 and 1 oz. loads in RGL hulls with Remington SP16 and R16 wads w/o any significant increase in load pressures. The loads crimp perfectly, and no changes to the powder charges are needed. It could not be simpler.

Joined: 28 Aug 2014 Posts: 924 Location: Eastern Tennessee

Thank you for sharing your experience. I was wondering if I was on an island on this issue.

Member Joined: 09 Sep 2014 Posts: 105 Location: Virginia

I use a bunch of them and never noticed any change in POI. However never shoot the Polywads at much distance and large patterns minor changes might not be noticed

No matter inside 20 yards they make a tight choked gun shoot like a open gun.shot a round of clays yesterday 100 targets used 14 spreaders. Rabbits and real close incomers. No doubt about it hit more than if I had used regular shells those shots.

Boats

Member Joined: 09 Sep 2014 Posts: 105 Location: Virginia

Should have put my glasses on, you said preassure !

Drop the shot load 1/8 oz to make room for the Polywad no noticeable difference in felt recoil. I would assume lighter shot more than compensates for the weight of the insert.

Boats

Joined: 28 Aug 2014 Posts: 924 Location: Eastern Tennessee

No problem Boats, still good to hear your experience with them.

I am planning to load this as suggest elsewhere on the site:

roughly 1/8 oz over the poly-wad and the rest under it

The patterning of others suggest to me that is the place to start. I didn't want to drop below 7/8 oz of an ounce, but wanted to pattern a gun before altering its choke.

I might also try a few 1 1/8 oz loads dropped down to 1 oz using the same theory.

Joined: 28 Apr 2010 Posts: 4 Location: Grand Rapids, MI

In my admittedly limited experience, they seem to be more or less a ballistically transparent item. You WILL have a minor pressure and / or velocity effect from the resulting difference in the weight of the shot unless you somehow compensate for that by adjusting something else. I also haven't noticed a significant difference between styles (e.g. the BPI 'X' inserts v. the PolyWad discs) in terms of patterning, but the discs are certainly handier in loads where I would normally think about an overshot card or filler of some kind, as they can take the place of them :D

Member Joined: 09 Sep 2014 Posts: 105 Location: Virginia

I put mine on top of the shot never tried some under some over. Seems to me it adds a step and would require weighing the two shot charges instead of dropping one with the measure. In any event Polywad over works good

Boats

Member Joined: 16 Nov 2006 Posts: 1338

Joined: 28 Aug 2014 Posts: 924 Location: Eastern Tennessee

Thank you mike, your test are what I was referring to in my earlier post. I hope to get imp cly patterns out of my mod choked model 31.

Member Joined: 09 Sep 2014 Posts: 105 Location: Virginia

That was a interesting post and appreciate it.

I use Polywads most in a Parker 12 with 1 oz # 7 1/2 Barrels are choked .32 right .40 left. And only on very short clay targets.

Working up some for a 16 G Trojan with less choke and 3/4 oz # 7 1/2 .patterns had holes. I went to # 9 shot and they filled out nice. I may try that some under some over technique and go back to 7 1/2. 9 is not the best shot for Rabbit targets. I could increase the shot load to 7/8 oz too.

Ideal is a gun choked for the job. However the disk are a viable option for tight choked guns that need to shoot the occasional short target

Boats

Member Joined: 09 Sep 2014 Posts: 105 Location: Virginia

Shame you don't live close, I would loan you my 16 G 31 with IC choke to compare to spreaders in the Mod gun

While I am opposed to opening expensive doubles, due to the chance of going wrong, have had several pump chokes opened up with good results. In fact I am looking at a M 31 20 G now that's Mod choked. If I buy it it's going to Briley to be opened up to IC. Holding me back is the guns price, which is a bit too high anyhow, and cost of the choke job landing at more than a IC gun would/should cost.

Boats

Joined: 21 May 2010 Posts: 603 Location: Victoria BC Canada

Poly wad spredr inserts;

http://www.polywad.com/spredr-inserts.html