Testimonials & Evaluations of Pb Blocker

By Cope Reynolds
Firearm Training Instructor
Host of The Shooting Bench

PB Blocker was originally formulated with the Glock pistol in mind. The stock Glock barrel has proven troublesome for many shooters that want to save money by shooting cast bullets instead of jacketed. They have found that the design of the Glock barrel has created some pre-mature leading problems which, in turn, can increase chamber pressures by changing the dimensions of the bore with build-up.


The success of the initial testing of this product was a pleasant surprise and we found that Pb Blocker was not only very effective in Glock barrels but had other uses as well. As one might expect, Pb Blocker was equally effective in other handgun barrels with conventional rifling. We soon found that even if leading occurred, it was much easier to remove from a barrel treated with Pb Blocker. The smoke and carbon fouling on stainless steel revolvers was much easier to clean off when properly treated. The big surprise was when we had customers telling us that they had used it in rifle barrels and were able to shoot lead bullets much faster with minimal or no leading, depending on bullet and barrel quality.


A local shooter fired 1000 hard-cast bullets through a Glock 22 without a cleaning and the amount of lead in the barrel was nearly undetectable. Removal of the lead was a very simple task.


Another fellow from Edgewood, NM found that he could shoot his cast bullets nearly 500 FPS faster in a British .303 when properly treated with Pb Blocker.
Clint Beyer of Beyer Barrels treats all his new barrels with Pb Blocker before shipping.


Initial testing indicates that Pb Blocker also makes removal of plastic wad fouling in shotgun barrels much easier to remove also we haven’t fully tested it yet.


Cope Reynolds

Host of The Shooting Bench


By Chuck Hudson

303 British leading tests.

Bullet: Lee: C312 -185-1R Sized to .313" Water quenched

Lead for bullets:  Wheel Weight+ Silver solder l0 parts WW to 2 parts solder Brinell scale of @ 22

Brass: Winchester Western multi- fired, neck sized using Lee Collet neck sizing die Part #90717

Powder Hornady Varget

Lube: Personal lube of 50% beeswax, 50% Alox stick

Hornady gas check .30 caliber

Rifle: British Lee Enfield No4 Mk2. Completely rebuilt by Enfield. New barrel. Action Redfield 3X9


Test date: 17 March 2010

Misc items, Bronze brush, Lewis Lead Remover, Hoppes # 9 solvent

Chronograph: Shootings Chrony Fl

Overall bullet length: 2.972"

Pb Blocker



My standard plinking load is 26.0grains of Varget which gives me and average velocity of 1650 fps.  Using this load gives me acceptable accuracy and minimal leading. On average I can shoot about 100 rounds before leading becomes an issue. At 50 rounds this loads leaves barely noticeable leading My accurate load for this bullet is 29 .7 grains of Varget which gives me sub minute of angle (T .13" at 200 yards off of sand bags) with a velocity average of l780fps +/- 20fos. Using this load I can fire @ 60-70 rounds before leading becomes an issue.


Since these bullets are cast lead the OAL is a bit shorter than the standard .303 jacketed round. My rifle likes an OAL of 2.972" The standard length I use for I 80 grain Sierra SPT is 3.078. OAL.  For the testing I used the MAX load for my.303 of 35.0 grains of Varget and the Lee C312 -185-1R bullet sized and lubed as above. Through my rifle, fired off of sand bags I got an average velocity of 2176 fps +l- 55 fps. I fired 50 rounds. After every 10 rounds, I pulled the bolt and using a bore light inspected the chamber throat and bore for leading. Leading was noticeable after 20 rounds and at 50 was very heavy.

I then thoroughly cleaned the bore of the rifle using first Hoppes #9 and abronze brush, then using Lewis Lead Remover and the Hoppes Solvent. No lead was visible in the chamber throat or the bore.  I then removed the fore stock of my Enfield and using a fish tail attachment on a propane torch I heated the barrel to @ 140 degrees. Temp was measured with a "meat" Thermometer in the muzzle and then chamber. I then applied the "Pb Blocker” and let the barrel cool to ambient air temperature @ 45 deg F (About an hour).


I then shot 50 rounds of my accurate load (the 1780 fps round) After every 10 rounds I checked the bore and chamber for leading. None was found. I then shot 50 rounds of my max load and checked the chamber again after every 10 rounds.  After 50 rounds I checked the bore and to my surprise the amount of leading was about equal to, maybe a bit less than my plinking load! Accuracy suffered, but this was due to driving the bullet 500 fps faster than my accurate load. This stuff is amazing! I just need to design a spitzer lead bullet for my .303 to take advantage of this stuff.

Folks do not believe that I can push a-WW lead bullet to jacketed speeds and not coat my barrel with lead. With the sample jar I have ione mine and my wifes Glocks G2l and Gl9, My Yugo SKS, and my M44 Moisin Nagant. Plus my 1858 Pietta Remington revolver converted to .45 Long Colt. I can't wait to try out the SKS and see if this cuts down on the leading on the gas port and barrel. I cast bullets for ALL my firearms from a 1833 Replica Pennsylvania long rifle to Enfield and Mosing Nagants. I am also going to try it in my shotgun rifled barrel since I cast slugs for it.

Whatever this stuff is, it is GREAT and you need to promote the hell out of it.

Chuck Hudson